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(No Model.)

T G LEWIS DENTAL HEATER.

No. 509,176. Patented NOV. 21,1893.

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THEODORE G. LEVIS, OF BUFFALO, NEV YORK, ASSIGNOR TO THE BUFFALO DENTAL MANUFACTURING COMPANY, OF SAME PLACE.

DENTAL HEATER.

SPECIFICATION forming part of Letters Patent No. 509,176, dated November. 21, 1893.

i Applioationled August 14:, 1893. Serial No. 483,045. (No modelJ To all whom it may concern,.-

Beit known that I, THEODORE G. LEW1s,a citizen of the United States, residing at the city of Bualo, in the county of Erie and State of New York, have invented a new and useful Improvement in Heaters, of which the following is a specification.

This invention relates to a heater for drying out and soldering an investment of metal 1o plate crown or bridge work in dentistry and has the object to provide a simple heater for this purpose which will enable the case to be dried quickly and the soldering of the teeth to the plate crown or bridge to be effected conveniently and expeditiously.

In the accompanying drawingsz-Figure l is a sectional elevation of my dental heater. Fig. 2 is a horizontal section thereof in line 2 2, Fig. l.

Like letters of reference refer to like parts in both figures.

A represents a base provided on its upper side with a boss a in which is formed a gas chamber b.

z 5 O is a gasinlet passage formed horizontally in the boss of the base and opening at its inner end into the gas chamber. To the outer end of this gas passage is connected a nozzle or pipe d to which a flexible gas supply pipe 3o or hose d may be attached.

lE represents a screw threaded valve stemV which is arranged in a screw threaded opening formed in the boss of the base, diametrically opposite the gas inlet passage and axi- 3 5 ally in line therewith. The inner end of this 'valve stem is provided with a conical or needle valve e which is adapted to bear against a valve seat e formed at the inner end of the gasinlet passage. The outer end of the valve 4o stern is provided with a knob or button e2 for turning the same whereby the valve can be moved toward or from its se'at for shutting off or regulating the supply of gas. By arranging the gas chamber, gas inlet passage 4; and valve in the base a very simple and inexpensive construction is obtained. g

F- represents a gas outlet nozzle secured to the upper portion of the gas chamber and provided with an external screw thread.

G represents a combining tube in which the gas issuing from the gas nozzle is mixed with air. This tube is secured to the gas nozzle by a screw threaded joint and provided in its side with a number of air inlet openingsg. The upper portion of the combining tube is contracted, forming an annular shoulder g.

H represents a circular supporting cup provided on its under side with a cylindrical socket or sleeve h which rotates on the upper 6o end of the combining tube and rests upon the shoulder g. VThe mixture of gas and air passes from the combining tube into the supporting cup through an opening h formed centrally in the bottom of the cup, and additional air is admitted to the supporting cup, through openings h2 formed i'n the bottom thereof around the socket.

I represents a hemi-spherical heating cup which is adapted to support the investment 7o while drying and soldering the same and which rests loosely upon the circular edge of the supporting cup. The diameter of the supporting cup at its edge is considerably-smaller than that of the heating cup so as to give the 7 5 cup a universal movement and permit it to be tilted in any direction, the tilting movement being limited by an annular flange t' formed around the edge of the heating cup. That portion of the bottom of the heating cup 8o which is arranged in the supporting cup is provided with a number of openingsj which permit the mixture of air and gas in theysupporting cup to pass into the heating'cup. The latter cup is filled with a bed loof broken' pum- 8 5 ice stone, asbestus, or other non-combustible material and the investment L is laid upon the same. The mixture ot' gas and air is divided as it passes upwardly between the pieces of pumice stone and is ignited above 9c the same, so that the flame entirely surrounds the dental investment and dries the moist plaster of paris case thereof.

M represents a cover which is placed over Vthe heating cup for confining the heat around the investment while the same is being dried. This cover is provided with a number of openings m which permit the air to circulate through the heating cup thereby preventing the liame from being smothered. When the roo case of the investment has been dried the cover is removed and the metal plate is soldered to the pins of the teeth While the gas is still burning. During the operation of soldering, the supporting cup can be rotated and the heating cup can be tilted so as to bring the investment into any desired position to facilitate the fioW of the solder and to bring all parts under the action of the blow pipe.

I claim as my invention- 1. In a heater, the combination with a supporting cup provided With an inlet passage, of a heating cup resting upon the supporting cup and capable of being tilted therein, substantially as set forth.

2. In a heater, the combination with a supporting cup provided with a circular edge and in its bottom with inlet openings, of a heini-spherical heating cup resting on the edge of said supporting cup and provided in its bottom with inlet openings, substantially as set forth.

3. In a heater, the combination with a supporting cup provided with a circular edge, of a heini-spherical heating cup resting on the edge of said supporting cup and provided in its bottom With inlet openings and around its edge with 'an annular stop ange, substantially as set forth.

4. In a dental heater, the combination with a base and a burner-tube rising therefronnof a rotary supporting cup provided on its under side with a sleeve or hub turning on said burner tube and a gas inlet coinciding with said sleeve, 'and a perforated heating cup resting in said supporting cup and capable of tilting therein, substantially as set forth.

Y Witness my hand this 10th day of August, '1893.

THEOD ORE G. LEWIS.

Witnesses:

CARL F. GEYER, JNO. J. BONNER. 

